Finding the type of a fault in underground cables using a megger should not be a difficult task. But, finding the exact location of the cable fault needs special techniques. Two of the popular techniques are the Murray and Varley loop tests for locating faults in underground cables. This article explains about few other popular techniques for locating faults in underground cables - viz. (i) Cable thumping, (ii) TDR, (iii) High voltage radar methods
Cable thumping for locating underground cable faultsA cable thumper is basically a portable high voltage surge generator. It is used to inject a high voltage DC surge (about 25 kV) into the faulty cable. If you supply a sufficiently high voltage to the faulty cable, the open-circuit fault will break down creating a high-current arc. This high current arc makes a characteristic thumping sound at the exact location of the fault.
Advantages and disadvantages of cable thumpingA major advantage of cable thumping is that it can locate open circuit faults very accurately. Also, this method is easy to apply as well as easy to learn.
Time Domain Reflectometer (TDR)
|Megger Time Domain Reflectometer|
|Signal transmitted through and reflected back from a fault|
Advantages and disadvantages of TDRAs a TDR sends a low energy signal into the cable, it causes no degradation of the cable insulation. This is a major advantage of using TDR to find the location of a fault in an underground cable. A TDR works well for open-circuit faults as well as conductor to conductor shorts.
[Also read: Types of underground cables]
High voltage radar methodsAs the low-voltage TDR is unable to identify high resistance ground faults, its effectiveness in finding underground cable faults is limited. To overcome this limitation of TDR, following are some popular high voltage radar methods. (i) Arc reflection method, (ii) surge pulse reflection method and (iii) voltage decay reflection method.
Arc reflection methodThe arc reflection method uses a TDR with a filter and thumper. The thumper (or surge generator) is used to create an arc across the shunt fault which creates a momentary short-circuit so that the TDR can show a downward deflection effectively. The arc reflection filter protects the TDR from high voltage surge generated by the thumper and routes the low-voltage signal down the cable.
[Also read: Grading of underground cables]
Surge pulse reflection methodThis method uses a current coupler, a thumper and a storage oscilloscope (analyzer). This method is used for long run cables and on faults that are difficult to arc over which do not show up using arc reflection method. In this method, a thumper is directly connected to the cable without a filter which can limit both the voltage and current applied to the fault. The thumper injects a high voltage pulse into the cable creating an arc at the fault, which subsequently causes a reflection of energy back to the thumper. The reflection repeats back and forth between the fault and the thumper till its energy gets depleted. The current coupler senses the surge reflections which are then captured and displayed by the storage oscilloscope.
Voltage decay reflection methodThis method uses a voltage coupler, a dielectric test set (high-voltage dc test set or proof tester) and a storage oscilloscope (analyzer). This method is used for transmission class cables when the generation of arc at the fault requires breakdown voltage greater than that a typical thumper or surge generator can provide. Here, the voltage coupler senses the reflections produced by the flashover of dc voltage at the fault and the analyzer captures and displays them.